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erratic idle on 1.8t a4


andyxros
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hi all, can you give me advice on where to look next i have bad idle and had codes 300 301 302 303 304 i clear them and it tickes over at 1000 rpm and no misfiring but after say 5 mins it gose to bad idle and pops from tailpipes, but revs up evenly and drives as nor,al its just tick ove speed thats the problem, changed maf sensor thats all ive done just gone round in circles with the code clearing etc, could it be the I.C.valve bunged up or not reponding to the ecu?????

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